Mitsubishi Grandis. Manual - part 840

 

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Mitsubishi Grandis. Manual - part 840

 

 

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-27

Code No.22: Input shaft speed sensor system

ENGINE-
A/T-ECU

INPUT SHAFT
SPEED SENSOR 

IGNITION
SWITCH (IG1)

Wire colour code
B : Black     LG : Light green     G : Green     L : Blue     W : White     Y : Yellow     SB : Sky blue
BR : Brown     O : Orange     GR : Gray     R : Red     P : Pink     V : Violet   

Input shaft speed sensor system circuit

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-28

OPERATION

The input shaft speed sensor detects the speed of 
the underdrive clutch retainer, and sends the 
information to the engine-A/T-ECU as a pulse signal.

DIAGNOSIS CODE SET CONDITIONS

The diagnosis code No.22 will be set if the input shaft 
speed sensor does not send a pulse signal for one 
second or more while the 3rd gears are engaged and 
the vehicle speed is 40 km/h or more (the output 
shaft speed sensor speed is 1000 r/min or more).
If the code No.22 is set four times, the transmission 
will be fixed in 3rd gear as a fail-safe measure. 
However, the transmission can be downshifted to 
2nd gear by operating the selector lever. 

POSSIBLE CAUSES

• Malfunction of input shaft speed sensor

• Malfunction of underdrive clutch retainer

• Damaged harness wires and connectors

• Malfunction of the engine-A/T-ECU

DIAGNOSIS

STEP 1. MUT-III data list

Item 0001: Input shaft speed sensor (Refer to data 
list reference table 

P.23A-117

). 

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction 

P.00-5

).

NO : 

Go to Step 2.

STEP 2. Connector check: B-112 input shaft 
speed sensor connector

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 3.

NO : 

Repair the defective connector.

STEP 3. Measure the resistance at input shaft 
speed sensor connector B-112.

Disconnect the connector, and measure the 
resistance between terminal 1 and earth at the wiring 
harness side.

OK: 2 

Ω or less

Q: Is the check result normal?

YES : 

Go to Step 9.

NO : 

Go to Step 4.

STEP 4. Measure the voltage at engine-A/T-ECU 
connector C-112.
(1) Connect input shaft speed sensor connector 

B-112.

(2) Turn the ignition switch to the ON position.

(3) Measure the voltage between engine-A/T-ECU 

connector C-112 terminal No.88 and earth.

OK: 0.5 V or less

Q: Is the check result normal?

YES : 

Go to Step 7.

NO : 

Go to Step 5.

AC302452

Battery tray

B-112 (B)

Harness side

Connector: B-112

AG

AC302452

Battery tray

B-112 (B)

Harness side

Connector: B-112

AG

AC311284

Connector: C-112 <LHD>

Connector: C-112 <RHD>

Harness side

Engine-A/T-ECU

C-112 (GR)

C-112 (GR)

Engine-A/T-ECU

AG

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-29

STEP 5. Connector check: C-112 engine-A/T-ECU 
connector

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the defective connector.

STEP 6. MUT-III data list

Item 0001: Input shaft speed sensor (Refer to data 
list reference table 

P.23A-117

). 

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Cope with Intermittent 

Malfunction 

P.00-5

).

NO : 

Replace the engine-A/T-ECU.

STEP 7. Connector check: C-112 engine-A/T-ECU 
connector, C-116 J/C (4)

Check for the contact with terminals.

Q: Is the check result normal?

YES : 

Go to Step 8.

NO : 

Repair the defective connector.

AC311284

Connector: C-112 <LHD>

Connector: C-112 <RHD>

Harness side

Engine-A/T-ECU

C-112 (GR)

C-112 (GR)

Engine-A/T-ECU

AG

AC311284

Connector: C-112 <LHD>

Connector: C-112 <RHD>

Harness side

Engine-A/T-ECU

C-112 (GR)

C-112 (GR)

Engine-A/T-ECU

AG

AC310615

C-116

Connector: C-116
<LHD>

AP

23

12

1

7

29

18

4

26

15

1314

25

24

2 3

1617

28

27

5 6

10

32

21

1920
3031

8 9

22
33

11

AC310628AS

C-116

Connector: C-116
<RHD>

23

12

1

7

29

18

26

13

25

24

2

28

27

4

15

14

3

1617

5 6

10

32

21

1920
3031

8 9

22
33

11

TROUBLESHOOTING <A/T>

AUTOMATIC TRANSMISSION (FF)

23A-30

STEP 8. Check the harness between input shaft 
speed sensor connector B-112 terminal No.1 and 
engine-A/T-ECU connector C-112 terminal No.88.

Check the earth line for open circuit.

Q: Is the check result normal?

YES : 

Go to Step 6.

NO : 

Repair the wiring harness.

STEP 9. Measure the voltage at input shaft speed 
sensor connector B-112.

(1) Disconnect the connector, and measure the 

voltage between terminal 3 and earth at the 
wiring harness side.

(2) Turn the ignition switch to the ON position.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 12.

NO : 

Go to Step 10.

AC302452

Battery tray

B-112 (B)

Harness side

Connector: B-112

AG

AC311284

Connector: C-112 <LHD>

Connector: C-112 <RHD>

Harness side

Engine-A/T-ECU

C-112 (GR)

C-112 (GR)

Engine-A/T-ECU

AG

AC302452

Battery tray

B-112 (B)

Harness side

Connector: B-112

AG

 

 

 

 

 

 

 

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